Han-xing Lu and Robert Stewart

ABSTRACT

Repeated or time-lapse seismic surveying for reservoir monitoring
attempts to image changes in the reservoir's fluid saturations,
pressure, and temperature resulting from hydrocarbon production. The
difference between seismic surveys acquired between the periods of
production or intervention then can be interpreted in terms of the
production-related changes in reservoir properties.

Time-lapse seismic analysis (a "4D" study) has been applied to
three 3-D seismic surveys acquired over the Blackfoot area, Alberta in
1993, 1995 and 1999. In this paper, only the vertical component data
processed into P-wave volumes are considered. The results indicate
that there are some changes in the reservoir rock properties during
production.